Why was it important for wegener to have evidence to support his hypothesis

Because if he doesn't support his claim then it will be taken as a false or incomplete,but his evidence will help make a point and be a better impact on his subjectivehope this helps:)

Answer accretion;

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.